Socket-transformer.



L. F. BRISLIN.

SOCKET TRANSFORMER.

APPLICATION FILED OCT. 13, I917.

1,274,380. v Patented Aug. 6, 1918.

J0 I H 3 g rfly a amvemtoz .Lea Bria/Dz,

0 6 WW 951, m M

(l t/town e1 vided with a plug LEO F. BRISLIN, 0F ASHLAND, KENTUCKY.

SOCKET-TRANSFORMER.

Specification of Letters Patent.

Patented Aug. 6, 1918.

Application filed October 13, 1917 Serial No. 198,454.

To all whom it may concern:

Be it known that I, Lno l BmsLIN, a citizen of the United States, formerly residing at Kokomo, in the county of Howard and State of Indiana, now Ashland, Boyd (10., Kentucky, have invented new and useful Improvements in Socket-Transformers, of which the following is a specification.

This invention constitutes an improvement in detachable voltage reducing devices for electric light sockets.

In electric lighting practice it frequently becomes desirable to maintain in continuous operation a lamp which may be.of very low candle power and still serve its purpose sulficiently well. The employment of lamps at the standard voltage for such economical operation is undesirable, as such lamps have filaments of extreme tenuity, which are readily broken by shocks and jars. Standard voltage lamps of higher candle power are often used, and th current consumed is reduced by inserting in the circuit a resist-' ance or inductance; but in this case a considerable proportion of the current is consumed in the voltage reducing device, and as the filament is operating at a temperature much below the normal, a further sacrifice of efiiciency occurs.

By the employment of low-voltage lamps of the miniature type, reducing the voltage to the proper degree, durability, efliciency, and economy may be obtained.

The invention aims primarily at the provision of a voltage reducing device having a body containing a transformer and profor detachably securing the body in a standard electric light socket, and with a rece tacle for holding a miniature electric lamp, a (1 so arranged that the voltage supplied to the standard socket will be reduced suitably for the miniature lamp, so that the latter may be instantly substituted for a standard'lamp when desired.

Another object is to provide a detachable transformer voltage reducing device for electric light sockets in which the transformer and the conductors between the transformer and the plug and receptacle of the device are entirely inclosed within the insulating body of the device.

A further object is to improve the construction of the body by the employment of a cylindrical insulating transformer shell and a transformer forin the open ends of which the plug and receptacle are sealed in the process of manufacture.

A form of the invention which is considered preferable is described in the specification below and illustrated in the drawlngs.

In the drawings,

Flgure 1 represents a section taken longitudinally through the device.

Fig. 2 represents a transverse section through the device on the plane indicated by the line 22 of Fig. 1.

In the preferred embodiment of the invention shown in the drawings, the device has a'hollow body indicated by the numeral 1. This body comprises a cylindrical shell 2 of insulating material, and insulating closures 3 by which the open ends of the body are sealed. The closures 3 may convenlently consist of a. material such as plaster of Paris, and said closures may be inserted in the ends of the body in plastic form at the time'of manufacture, and allowed to harden. A suitable plug 4, such as commonly employed for connecting electric devices to electric light sockets is secured to one end of the body 1, and a receptacle 5 of the ordinary construction for holding a miniature low-voltage incandescent lamp 13, is secured to the other end of the body. Preferably, the plug l and receptacle 5 are partially embedded in the closures 3 in the process of manufacture, and are thereby sealed into the respective openings of the shell 2.

Within the body 1 is inclosed a stepdoWn transformer 6, consisting in the present instance of a primary Winding 7, a secondary winding 8, and a core 9. The ends of the primary winding are connected by suitable conductors 10 with respective terminals of the plug 4. The ends of the secondary Winding are connected with respective terminals of the receptacle 5 by conductors 11.

The conductors 11 may be further connected to binding posts or terminals 12 extending outwardly through the shell 2. By cans of the terminals 12 any lowvoltage device, as for instance a bell or electrical toy, may be supplied with current at-thhreduced voltage provided for the lamp 13.

elongated form of. the body 1, the device may be inserted in a socket provided with a shade without removing the latter, rendering it moreronvenient in use. The construction by which the transformer and the conductors connecting the primary winding and the plug are hermetically sealed within the body eliminates all danger of the user receiving a shock, and is calculated 'to ett'ectually protect the transformer andhighvoltage conductors against damage and short-circuits.

I am aware that the invention is not limited in scope to the particular form shown, and the right is reserved to such departures from and modifications of the preferred form as fall Within the breadth of the claim.

What is claimed is:*

In a device of the class described, an elongated cylindrical shell, an insulating closure sealed in each end of said shell, a plug sealed into one of said closures. a socket sealed into the other closure, a transformer having primary and secondary windings,conductors connecting the primary winding of the transformer and the plug, conductors connecting the secondary winding of the transformer and the socket, and

a pair of terminals extending through said shell and having their inner ends connected to said but named conductors, said transformer and said conductors entirely inclosed by said shell and said closures.

In testimony whereof I afli'x my signature.

' LEO F. BRISLIN. 

